🩹(frontend) enable React Query for token management

Previously, I prevented clients from fetching new tokens when data is stale.
It seems totally wrong. Enabling data refresh addresses potential issues
with random user disconnections.

Please note the data refresh when stale was only disabled for people
who created the room.

src/frontend/src/features/rooms/components/Conference.tsx

@@ -50,7 +50,6 @@ export const Conference = ({
   } = useQuery({
     queryKey: fetchKey,
     staleTime: 6 * 60 * 60 * 1000, // By default, LiveKit access tokens expire 6 hours after generation
-    enabled: !initialRoomData,
     initialData: initialRoomData,
     queryFn: () =>
       fetchRoom({